Do you have any experience? Do yourself a favor and find a used XL650 or KLR650 and find some dirt trails. Hone your skills in the dirt for a few months, dirt hurts a little less than asphalt. After that, take a motorcycle safety course. Start riding with a friend that has a few years under his belt. Pay attention to everything around you at all times. After you are comfortable riding the enduro, upgrade to whatever you feel you can handle. Learning good riding habits and mastering your bikes functions can make the difference between a nice ride, or a nice ride in an ambulance.